Can we please use standard terminology in problems? Or at least put it in bold that the problem has a non-standard definition?

https://codeforces.me/contest/2108/problem/E The problem in question. It refers to edge contraction as "edge deletion". This confused the heck out of me, because I imagined that the problem was actually about edge deletion (delete edge, add a new edge in its place so that it remains a tree).

I also wanted to ask setters to use native english speakers, but it seems that there was more than one such tester so I have no idea how this ended up being left in the actual round...